Underfeed stoker



R.-S. RILEY- UNDERFEED STOKER.

APPLICATION FILED AUG.4, 19,19.

Patented June 6,1922.

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' Patented June 6, 1922.

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A UNDERFEED STOKER.

APPLICATION FILED AUG.4, 19:9.

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ROBERT SANFORD RILEY, E WORCESTER. MASSACHUSETTS, ASSIGNOR To SANFORD RILEY STOKIEER (30., OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

Specification of Letters Patent. Patented June 6, 1922.

Application filed August 4, 1919. Serial No. 315,167.

' T 0 all whom it may concern:

Be it known that I," RoBEnT SANFORD RILEY, a citizen of the United States, residing at lVorce'ster, in the county of WVorcester and State of Massachusetts, have invented a new and useful Underfeed Stoker, of which the following is a specification.

This invention relates to an underfeed stoker of the type in which the retort side walls are laterally movable.

It is the principal object. of my present invention to provide improved operating mechanism for reciprocating the side walls of the retort, such mechanism preferably deriving motion from the coal feeding plunger. Connections may also be provided for reciprocab ingthe retort bottom plate longitudinally of the retort. A feature of my invention also relates to the provision of connections whereby the relative movement of the side walls and the retort bottom plate may be adjusted as desired.

Other features of my invention relate to a device for lifting and. spreading the fuel at the rear end of the retort, and to certain arrangements and combinations of parts which will be hereinafter described, and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the'drawings in which- Fig. 1 is a longitudinal sectional elevation of my improved Stoker;

Fig. 2 is a transverse sectional elevation taken along the li e 2-2 in Fig. 1;

3 is a oailtial plan view with the retortside wall" and overfeed'grate sections removed Fig. 4 is a plan view of two of the side wall and overfeed grate sections;

Figs. 5 and 6 are partial longitudinal sections taken along the lines 5-5. and 66 in F ig. 2;

i Fig. 7 is a partial side elevation, looking in the direction of the arrow 7 in Fig. 2';

Fig. 8 is a partial plan view of a slight modification, and y "Fig. 9' is a sectional view on the line 9-9 in Fig. 1.

' Referring to the drawings, I have shown my improved underfeed stoker as comprising ahopper 10 adapted to supply coal to a cylindrical passage 11, within which a coal feeding plunger 12 isfreciprocated in any convenient manner, as bya piston 13 connected to the plunger 12 by a piston rod 14 and reciprocated in a cylinder'15 by compressed air, steam, water, or othersuitable 'operating mediumf It will be understood that the specific means used for actuating the plunger 12 may be varied to suit the conditions of operation.

The passage 11 has a rearwardly enlarged opening 16 through which the coal is fed to the retort bythe plunger 12. The side walls of the retort are formed of laterally moving members 17, each comprising a retort side wall portion 18, an overfeed grate 19, and preferably a discharge plate 20. v These collective members forming retort sections 17 are successively disposed longitudinally of the retort in opposed pairs, and provision is made for alternately reciprocating adjacent sections 17. As shown in Figs. 2 and 3, the opposed members of each pair ar also arranged to alternately approach and recede from each other.

The discharge plates 20 are pivoted at 21 to the outer ends of the retort sections 17, and extend outward and downward from their pivots. The plates 20 are preferably 'also'supported at intermediate points by rolls 22 mounted on arms 23 fixed to a shaft 24 which in turn is suitably mounted in bearings in the frame of the stoker. The arms 23 are manually adjustable to raise and lower the rolls 22 as desired. In this manner the openings between the outer ends ofthe discharge, plates and the side walls 24 may be suitably adjusted to the fuel and to the state of combustion in the furnace.

- The retort is provided with a longitudinally movable retort bottom plate 26 (Fig. 1) the rear end of which is covered by a wedge or plow-like member 27 (Fig. 9) fixed to the rear end of the retort. and

adapted to raise and spread laterally such bottom plate 26. One of the bars 34 is provided at each side of the retort to operate the retort sections on one side thereof.

The two bars 34 are connected by a cross head 35 (Fig. 1) to which is-firmly secured a post 36, in which is'threaded a bolt or headed stud 37 extending through an arm 38 fixed to the plunger 12 p and movable therewithf 'A lug 39 on the underside of the retort bottom plate 26 also supports a post 40 in which is threaded a bolt or stud 41 likewise extending through the arm 38.

As the arm 38 moves with the plunger 12, it engages the posts 36 and 40 at one end of its path of travel, and the heads of' the studs 37 and 41 at the opposite end of its travel, thus having a lost-motion connection by which theplate 26 and bars 34 are reciprocated, forrelatively shorter distances. Theamount oflost-motion may be reduced by placing removable collars 42 on the studs 37 and 41 as indicated in Fig. 1. In this way, the relative movement. of the plate 26 and bars 34 may be varied as desired.

In Fig. 8 I have shown a slightlymodified. arrangement of the levers 28 by which opposite retort sections will move simultaneously in the same direction to the right or to the left, maintaining a substantially constant distance between them, while alternate successive sections will move in opposite directions as in the form previously described.

For a more complete description of the structure of the retort sections and the functions of the section parts, reference is made to my co-pending application Serial No. 315,165 filed herewith. It will be understood that the space beneath the retort is enclosed to form an air chamber to which air under pressure may be admitted through adamper-controlled opening 43 and from. which air at reduced pressure may be admitted bydampers 44 to the overfeed grate portions 19 of the retort sections.

Having thus described my invention, it will be evident that changes and modifications can be made therein by those skilled in the art, within the spirit and scopeof my invention as set forth in the claims, and I do not wish to be otherwise limited to the dc tails herein set forth, but whatI do claim 1. An underfeed stoker, having, in combination, a retort having side walls formed in sections successively disposed along'said retort, and means to alternately reciprocate adjacent sections, saidineans comprising a bar reciprocated longitudinally of said retort, and a plurality of levers engaged thereby, said levers being directly connected to of said retort, means to, move said bar, means to adjust the extent of such movement, and

a plurality of levers engaged by said bar and each directly connected to move a .pair of adjacent wall sections simultaneously in opposite directions.

3. An underfeed stoker, having, in combination, a retort having sidewalls formed in sections successively disposed along said retort, and means to alternately reciprocate adjacent sections, said means comprising a plurality of levers mounted on fixed pivots, a bar engaging said levers, and means to reciprocate said bar longitudinally of said retort, each lever having upwardly extended connections to a pair of adjacent wall sections and being eifective to reciprocate said sections simultaneously in opposite directions.

4. An underfeed stoker, having, in combination, a retort having side walls formed in sections successively disposed alongsaid retort, and means to alternately reciprocate adjacent sections, said means comprising a three-armed lever for each pair of adjacent sections, means to connect opposite. lever arms to adjacent sections, and a reciprocating member engaging the third arm of said leverto oscillate said lever and reciprocate said sections.

5. An underfeed stokerhaving, in combination, a retort having side walls formed in sections mounted for transverse movement, a coal feeding plunger, and lost motion connections between said plunger and said walls, whereby the adjacent sections of the latter are transversely reciprocated alternately in opposite directions during a portion only of the movement of said plunger. M

6. An underfeed stoker having, in combination, a retort having a longitudinally movable bottom plate and laterally movable side walls, a coal feeding plunger for said retort, means to reciprocate said, plunger. and lostmotion connections from said plunger to said bottom plate and to said side walls, whereby reduced motion may be communicated to said plate and to said walls from said plunger during a portion only of the movement of the plunger.

In testimony whereof I have hereunto affixed my signature.

ROBERT SANFORD RILEY. 

